I've been trying to reason with Creationists for more than 30 years, beginning with debates on talk.origins back in the early 1990s. Sometimes we make a little progress but most of the time it's very frustrating.
Over the years, we've encountered a few outstanding examples of creationists whose "reasoning" abilities defy explanation. One of he most famous is Otangelo Grasso - his ability to misunderstand and misconstrue science is legendary. He is one of only a small number of people who are banned from Sandwalk.
Here's an example of his unique unreasoning abiltiies.
Trying to educate a creationist (Otangelo Grasso)
I bring this up because he recently posted an artilce on the Uncommon Descent blog and you just have to read it if you want a good laugh. It shows you that 30 years of attempting to teach science to creationists isn't nearly long enough.
Otangelo Grasso on the difficulties of reasoning with atheists